New tires, would like to regear to compensate

I have a 2010 silverado 1500 with the 5.3L and the 6 speed, and the 3.08 gear. I have recently added a lift and tires and obviously truck no longer has the grunt off the line like it did. I know I need to change gear to fix this small issue, I would like to know which gears would be ideal for the new tires and still keep my mileage from falling thru the floor. I had the 265/65/18 tires stock, and now I am running a 305/65R18 almost exactly 2 inches taller, I know I will not get it exactly like it was but I was considering a going to 3.73's. Will they fir with my current carrier in my front diff? The rear diff should be fine. Any info would be greatly appreciated.
Thanks
Blu

I have a 2010 silverado 1500 with the 5.3L and the 6 speed, and the 3.08 gear. I have recently added a lift and tires and obviously truck no longer has the grunt off the line like it did. I know I need to change gear to fix this small issue, I would like to know which gears would be ideal for the new tires and still keep my mileage from falling thru the floor. I had the 265/65/18 tires stock, and now I am running a 305/65R18 almost exactly 2 inches taller, I know I will not get it exactly like it was but I was considering a going to 3.73's. Will they fir with my current carrier in my front diff? The rear diff should be fine. Any info would be greatly appreciated.
Thanks
Blu

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If this truck is 4 wheel drive you need to change both fron and rear to match. I wouldnt go any more than 3.23 with that size tire.

SS, yes the truck is 4wd and since I was talking about concerns for the front diff should have been a give away . And you think a 3.23 gear is right? Or did you mean 3.73?
Thank you fleetwood, the chart helps. But 1 concern, question I have is will I need to get a new carrier for the front diff will it all fit in the case?
Since I have the 6 speed and reading the other posts about this I'm really considering going to the 4.11's and calling it a day

SS, yes the truck is 4wd and since I was talking about concerns for the front diff should have been a give away . And you think a 3.23 gear is right? Or did you mean 3.73?
Thank you fleetwood, the chart helps. But 1 concern, question I have is will I need to get a new carrier for the front diff will it all fit in the case?
Since I have the 6 speed and reading the other posts about this I'm really considering going to the 4.11's and calling it a day

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ya I want sure if you had a 4x4 since you were talking about keeping the rear the same.....with a 18 inch tire 4.11 may bring your rpm to high at freeway speeds.

I have 4.10's with 34.5" tire and at 60mph I'm turning 1,900 rpm's. My tach says 2,100 but may scanner says 1,900 rpm's . I go with the scanner because every factory tach is like a factory speedo, there off a little.